Operation (Hardware references)
9.2 Power amplifiers
The power amplifiers fitted to the D40 utilize Class D technology
similar to a switch mode power supply. Compared to the known
linear amplifier concept (Class A, AB, G or H), Class D power
amplifiers produce less heat and allow for a compact and light-
weight design.
While supplying very high maximum output swing, they maintain
high efficiency with any kind of signal and load and run as cool as
possible. Channels share the same power supply and are thermally
coupled to provide even higher average power figures when
unevenly loaded. TOP/SUB setups and active cardioid subwoofers
are cases of typical use. A sophisticated circuit design decreases
the impact of the load on the amplifier performance and enables a
well defined sound reproduction. A comprehensive set of
protection features individually prevents each channel from
overload and/or damage/defect. Channels that are not affected
will continue to operate, if safely possible.
9.3 Cooling fans
Two temperature and level controlled fans are incorporated for
cooling the internal components, which allows greater cooling
during louder program material. The fan speed is consequently
reduced during quieter passages preventing background noise
interference. If the unit heats up a «Temp. Warning» is issued and
the fans will give full cooling power permanently.
d&b D40 Reference manual 1.5 en64
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